.fill-area {
    display: table;
    z-index: -1;
    position: absolute;
    top: -320000px;
    left: -320000px;
    width: 640000px;
    height: 640000px;
  }
  
  .background {
    background-color: #ffffff;
    opacity: 1;
    background-image: linear-gradient(#f1f1f1 3.2px, transparent 3.2px),
      linear-gradient(90deg, #f1f1f1 3.2px, transparent 3.2px),
      linear-gradient(#f1f1f1 1.6px, transparent 1.6px),
      linear-gradient(90deg, #f1f1f1 1.6px, #ffffff 1.6px);
    background-size: 80px 80px, 80px 80px, 16px 16px, 16px 16px;
    background-position: -3.2px -3.2px, -3.2px -3.2px, -1.6px -1.6px,
      -1.6px -1.6px;
  }
  